There were 2 large cookie jars filled with weed in plain view. There were also 4 - 5 empty codeine bottles in the mansion.There were also 3 bongs -- 1 in the TV room and 2 in the kitchen.There were styrofoam cups scattered throughout the house that had elaborate drawings on them ... including the names of the people who used them. The cups, we're told, were used for Sizzurp (also called lean) -- which is Justin's drug of choice. We're told he likes to draw on the cups with markers after using them.And speaking of Sizzurp ... Sprite is usually part of the mix, but we're told Justin preferred pineapple Fanta instead. There were empty Fanta bottles that were discolored ... we're told from the codeine.There were lots of "swisher sweets" cigars laying around the house -- Bieber's preferred way to smoke marijuana.And speaking of weed … we're told Justin has a dedicated smoking room in the house, complete with hookah pipes. Sources say when cops showed up ... some of his friend went into the room and some of the illicit stuff went down the toilet.